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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b2909633979ab0386d1ec7c1c8a6b09aae65160774cc08139ad41fdd3beb9d' 
  AND token = 'lu9QZuiEZqVGz79I0xz6s2zeCkRsVQilS9AAXAiN9TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}